Roll-over machine



Aug. 15, 1933. E. F. OYSTER ROLL-OVER MACHINE Filed Nov. 4, 1929 3Sheets-Sheet 2 JNVENTOR. 637% JO zer A TT0 Aug. 15, 1933. E. F. OYSTERROLL-OVER MACHINE Filed Nov. 4, 1929 3 Sheets-Sheet 5 ATTORNE 5 PatentedAug. 15, 1933 ROLL-OVER MACHINE Earl F. Oyster, Cleveland Heights, Ohio,assignor to The Osborn Manufacturing Company,

Cleveland, Ohio, a Corporation of Ohio Application November 4, 1929.Serial No. 404,845

11 Claims.

The present application relates, as indicated, to a roll-over machine,and more particularly to a device for inverting foundry molds byswinging them about horizontal pivots disposed in prolongation of theends of the mold. The primary object of the invention is to provide anautomatically operable machine of the character indicated. A furtherobject of the invention is to provide a machine of the characterindicated which shall be power operated and very smooth in itsoperation. Further objects of the invention will appear as thedescription proceeds. To the accomplishment of the foregoing and relatedends,said invention, then, consists of the means hereinafter fullydescribed and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which theprinciple of the in vention may be used.

In said annexed drawings:

Fig. 1 is a perspective view of a machine constructed in accordance withmy invention; Fig. 2 is a side elevation of the upper portion of themachine; and Fig. 3 is a View similar to Fig. 2, the parts havingassumed a different set of relative positions.

Referring more particularly .to the drawings, it will be seen that Ihave provided a frame 10 comprising a pair of spaced upstanding elements11 and 12, each of said elements being provided adjacent its upper endwith an inwardly facing disc 13 centrally provided with a bearing hub14. In order to remove the finished molds from the machine, the arm 1swings horizontally about a post 2 to and from a position betweenuprights 11 and 12, this post 2 being one of the rigid elements of themachine frame. The arm has a central opening 3, through which a squeezetable 4 can be moved up and down by a cylinder 5, in the usual manner.Two parallel bars 6, 6 bridge. this opening 3 and, when not supported bythe table 4, rest on their ends at the notches '7, on the arm 1 at theends of the opening 3 to support a flask in a manner hereafter to bedescribed. Thehorizontal plate 3 constitutes the floor plate of themachine, and is at the level of the foundry floor. A rock over table 15is mounted between the upper ends of said elements 11 and 12, and isprovided at each of its ends with an upstanding ear 16 having a portionthereof rebent to form a part-annular channel 17 fitting over one ofsaid discs 13. Each of the ears 16 (c1. tea-33) is provided on its innerface with a hub 18 formed with a central aperture 19 therein for thereception of a pin 20 received in said bearings 14. The table isprovided adjacent its opposite ends with U-shaped members 21 pivoted tosaid table and adapted to be moved into retaining engagement with a moldflask placed on said table, said members 21 being operable through themedium of handles 22.

At a point below the bearings 14, the frame member 11 is provided with apair of laterally extending lugs 23, each of said lugs being formedadjacent its outer end with an aperture 24 in which is journaled a pin25. The pins 25 are carried substantially centrally of a cylinder 26,whereby said cylinder is mounted to oscillate about a substantiallycentral horizontal axis.

In the embodiment shown, the cylinder 26 is provided at its lower endwith a flange 27 and at its upper end with a flange 28. To the flange 27is suitably secured a head 29 provided with a passage 30 communicatingwith the interior of said cylinder 26 and adapted to have connectedthereto a flexible hose 31 leading from a source of fluidunder pressure.To the flange 23 there is secured a head 32 formed with a passage 33com-- municating also with the interior of the cylinder 26 and havingconnected thereto a flexible hose 34 leading likewise from a source offluid under pressure. The head 32 is centrally apertured and ispreferably formed to provide a chamber 35 adapted to receive packingmaterial. A gland 36 is entered in said chamber 35 and is movablethrough the medium of nuts 37 and bolts 38 to compress the packing insaid chamber.

Within the cylinder 26 there is reciprocably mounted a piston 39 havingconnected thereto a shank 40, the upper end 41 of which projects throughsaid chamber 35 and gland 36 to the exterior of the cylinder 26. Ashield 42 is preferably secured to said upper end 41 of the shank for areason later to be mentioned.

At a point intermediate the lugs 23 and the bearings 14, the framemember 11 carries a second pair of lugs 43 to which is pivoted one end44 of a lever 45 through the medium of a pin 46. At a point removed fromthe pivot point 46 by a distance substantially equivalent to thedistance from said pivot point 46 to the upper end 47 of the framemember 11, the lever 45 is curved upwardly as at 43, and the end 49 ofsaid lever 45 has pivoted thereto one end of a link 50 through themedium of the pin 51. The opposite end of said link 50 is pivoted at 52to an element which may be termed a housing 53 secured to the channeledportion 17 of one ear 16 on the table 15. At a point intermediate theend 44 and the curved portion 48 of the lever 45, said lever is providedwith a laterally or downwardly projecting lug 54 which, through themedium of a pin 55, ispivoted to the upper end 410i the shank 40.

The operation of the herein disclosed device is believed to be obvious,but it maybe noted that, if fluid under pressure is admitted through thehose 31 and the passage 30 to the portion of the interior of thecylinder 26 below the piston 39, said piston will be moved upwardly inthe cylinder 26. Such movement of the piston results in clockwiserotation of the lever about its pivot point .46, such movement beingtransmitted through the link to the. ear 16. As will be obvious from acomparison of the relative positions of the parts in Figs. 2 and 3, theparts are so proportioned that a 90. movement of the lever 45 results ina 186 oscillation of the table 15 about the pins 20. This movement ofthe lever 45 is, of course, accompanied by an oscillation of thecylinder 26 about its pivots 25, such oscillation being in acounter-clockwise direction during the first portion of the movement ofthe lever 45, and in a clockwise direction during the latter portion ofsuch movement. Obviously, if fluid under pressure isadmitted through thehose 34 and the passage 33 to the portion of the interior of thecylinder 26 above the piston 39, the parts will be moved back into thepositions illustrated in Fig. 2. r

The cycle of operations of the entire machine is as follows. The table15 and operating linkages being in the position of Figs. 1 and 2, and apattern plate being secured to' what is then the upper side of the'table15, the operator manually places an empty flask over the pattern plate,fills the flask with sand; either, with a shovel or by admitting sandfrom a chute, strikes the. sand off level, places the bottom board, and

' fastens the clamps 21 over the ends of the bot.-

tom board. Air is then admitted at 30, thus in-- verting the table 15with the flask securedtheree to. ,The table 4 is then raised by thecylinder '5 carrying up the bars 6 into contact with the bottom of theflask and squeezing the mold upwardly against the inverted table 15,which at this time serves as a squeeze head. The clamps 21 are thenreleased, and the table 4 lowered. On the downward movement the bars 6,with the mold thereon, go down with the table until their end notches '7are stopped by the arm 1. The table 4 continues its downward movementsuiiiciently to clear, after which the arm 1 is swung out around itspivot 2 and the mold is removed by suitable conveying means. The table15 is again brought to the position of Fig. 1 and the cycle repeated, itbeing understood that the same pattern plate will serve for making theentire series of molds of any particular pattern.

It is desirable to protect certain points in this apparatus from fallingsand and other dirt which may fall from the flasks or from the table 15.Consequently means have been provided for protecting all pivot pointswhich, at any time, lie below the level of the table 15. .As will beobvious, the point 55 always lies below that level, and the ears 54 areso designed as to protect this pivot point. The shield 42 at all timesprotects the relatively reciprocable parts 41 and 36, and a shield 57 atall times protects the pivot point 25. A guard 56 is provided to protectthe pivot point 51 when the latter is in the position of inder andadapted to be Fig. 3, and the housing 53 protects the pivot point 52 inthe position of Fig. 3.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a device of the class including f al a table supported by bearingson ioans associated with said table for h son with said pivcts inproion. on of the moi -nds, a cylin der mounted on said frame, a pistonin said cy1- reciprccated therein,

piston and said table 'by a single stroke of said piston in onedircction causes oscillation of said table 180 about its axis.

2. In a device of the class described, a frame including fixed standardsand pivots fixed on said frame in horizontal alignment, at tablerotatably supported upon said pivots, means for holding a mold on saidtable between said pivots, a cylinder pivotally mounted on said framegapiston in said cylinder and adapted to be reciprocated therein,'andmeans connecting said piston and said table whereby reciprocationof saidpiston causes oscillation of said cylinder about its pivotal axis andinversion of said table upon its axis from one to another of thevertically aligned positions.

3. In a device of the class described, a frame including fixed standardsand pivots fixed on said frame in horizontal alignment, a tablerotatably supported upon said pivots, a cylinder pivotally mounted onsaid frame, a piston reciprocable in said cylinder, a link pivoted tosaid frame and having a pivotal connection with said piston and aconnection with said table, whereby a single stroke of said piston inone direction causes inversion of said table upon its axis from one toanother of two vertically aligned positions.

4. In a device of the class described, a frame, a table pivotallymounted on a fixed horizontal axis in said frame, means on said tablefor holding a mold thereto with a horizontal axis of the mold coincidentwith said horizontal axisof the table, a cylinder pivotally mounted onsaid frame, a piston in said cylinder, a link having its one end pivotedto said frame, means connecting the other end of said link to saidtable, and means connecting said piston to said link intermediate theends of said link.

5. In a device of the class described, a frame, a table pivotallymounted on a horizontal axis in said frame, a cylinder pivotally mountedto oscillate on a horizontal axis below and to one side of the axis ofsaid table, a piston reciprocable in said cylinder and projectingthrough the upper end thereof, a link having its oneend pivoted to saidframe at a point intermediate the pivotal axes of said table and saidcylinder, and means connecting the other end of said link to said tableat a point above the pivotal axis of said table, the projecting end ofsaid piston being connected to said link at a point intermediate theends of said link.

, 6. In a device of the class described, a frame, a table pivotallymounted on a horizontal axis in said frame, a cylinder pivotally mountedto ibed, a frame icrizontal piv oscillate on a horizontal axis below andto one side of the axis of said table, a piston reciprocable in saidcylinder and projecting through the upper end thereof, a link having itsone end pivoted to said frame at a point intermediate the pivotal axesof said table and said cylinder, and above the normal position of thefree end of said piston, means connecting the other end of said link tosaid table at a point above the pivotal axis of said table, theprojecting end of said piston being connected to said link at a pointintermediate the ends of said link, and means for forcing fluid intosaid cylinder to move the free end of said piston to a point above thepivot point of said link on said frame.

'7. In a device of the class described, a frame including fixedstandards and pivots fixed on said frame in horizontal alignment, atable rotatably supported upon said pivots, means for holding a mold onsaid table between said pivots, a link pivoted at one end to said frameand at the other connected to said table, and means for moving said linkabout its pivotal axis on said frame to cause oscillation of said tableabout its pivotal axis, the limiting positions of oscillation of thetable being in vertical alignment.

8. In a device of the class described, a frame including fixed standardsand pivots fixed on said frame in horizontal alignment, a table r0-tatably supported upon said pivots, a curved link moving saidfirst-mentioned link about its pivotal axis on said frame by a singlepiston stroke in one direction to cause oscillation of said table aboutits pivotal axis between two vertically aligned end positions.

9. In a device of the class described, a frame including fixed standardsand pivots fixed on said frame in horizontal alignment, a tablerotatably supported upon said pivots, a level pivoted to said frame, andmeans connecting said lever to said table whereby oscillation of saidlever through 90 about its pivotal axis causes oscillation of. saidtable through 180 about its pivotal axis between two vertically alignedpositions.

10. In a device of the class described, a frame, a table pivotallymounted on a horizontal axis in said frame, a lever pivoted to saidframe, means connecting said lever to said table whereby oscillation ofsaid lever through 90 about its pivotal axis causes oscillation of saidtable through 180 about its pivotal axis, and means verticallyreciprocable and horizontally oscillable with respect to said frame forshifting said lever.

11. In a device of the class described, a frame, a table pivotallymounted on a horizontal axis in said frame, a lever pivoted to saidframe, means connecting said lever to said table whereby oscillation ofsaid lever through 90 about its pivotal axis causes oscillation of saidtable through 180 about its pivotal axis, and fluid-actuated meansvertically reciprocable and horizontally oscillable with respect to saidframe for shifting said lever.

EARL F. OYSTER.

